doc: adjust PG 14 relnotes to be current

Bruce Momjian <bruce@momjian.us>

Commit: 69a58bfe4ab05567a8fab8bdce7f3095ed06b99c
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-06-21T05:09:32Z
Releases: 14.0
doc:  adjust PG 14 relnotes to be current

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doc/src/sgml/release-14.sgml modified +13 −3

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